OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This malware targets Windows 8 users and uses Google Docs for its C and C communication to prevent easy detection and removal.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

It retrieves specific information from the affected system.

TECHNICAL DETAILS

File Size: 151,552 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 21 Nov 2012

Payload: Steals information, Compromises system security

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This backdoor adds the following mutexes to ensure that only one of its copies runs at any one time:

G46A33F21110

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

Terminate itself

Download and execute files

Change IP

Open command line

Information Theft

This backdoor retrieves the following information from the affected system:

Current folder path

Domain admin

Domain name

GUID

Host name

Local admin

OS build version

User name

Windows base version

Windows version

NOTES:

This backdoor uses the following URL as its proxy server to connect to its C&C to avoid detection:

https://docs.google.com

SOLUTION

Minimum Scan Engine: 9.300

FIRST VSAPI PATTERN FILE: 9.540.03

FIRST VSAPI PATTERN DATE: 21 Nov 2012

VSAPI OPR PATTERN File: 9.541.00

VSAPI OPR PATTERN Date: 22 Nov 2012

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as BKDR_MAKADOCS.JG. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.